r: Fix Objective-C++ detection on 10.8.x

The tests used by R's configure scripts are broken starting with 10.8. Add a
patch to hotfix this until it gets sorted upstream.

Upstream bug:

  https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=15107

Fixes #15739.

1 files changed, 55 insertions, 0 deletions

diff --git a/Library/Formula/r.rb b/Library/Formula/r.rb
index 35a864521..b25a4d4f9 100644
--- a/Library/Formula/r.rb
+++ b/Library/Formula/r.rb
@@ -23,6 +23,12 @@ class R < Formula
 
   depends_on 'valgrind' if build.include? 'with-valgrind'
 
+  def patches
+    # Fix detection of Objective-C++ in configure. Reported upstream:
+    #   https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=15107
+    DATA
+  end if MacOS.version >= :mountain_lion
+
   def install
     ENV.Og if build.include? 'with-valgrind'
     ENV.fortran
@@ -71,3 +77,52 @@ class R < Formula
     EOS
   end
 end
+
+__END__
+
+Patch configure so that Objective-C++ tests pass on OS X 10.8.x. The problem is
+that every test uses the header file `objc/Object.h` to define Objective-C
+objects and this header is a no-op include on 10.8 unless the `__OBJC2__`
+preprocessor variable is undefined.
+
+Upstream bug:
+
+  https://bugs.r-project.org/bugzilla3/show_bug.cgi?id=15107
+
+diff --git a/configure b/configure
+index 5bae281..baf4f47 100755
+--- a/configure
++++ b/configure
+@@ -8328,6 +8328,7 @@ $as_echo_n "checking whether ${OBJCXX} can compile ObjC++... " >&6; }
+ ## we don't use AC_LANG_xx because ObjC++ is not defined as a language (yet)
+ ## (the test program is from the gcc test suite)
+ cat << \EOF > conftest.mm
++#undef __OBJC2__
+ #include <objc/Object.h>
+ #include <iostream>
+ 
+@@ -8368,6 +8369,7 @@ $as_echo_n "checking whether ${CXX} can compile ObjC++... " >&6; }
+ ## we don't use AC_LANG_xx because ObjC++ is not defined as a language (yet)
+ ## (the test program is from the gcc test suite)
+ cat << \EOF > conftest.mm
++#undef __OBJC2__
+ #include <objc/Object.h>
+ #include <iostream>
+ 
+@@ -8403,6 +8405,7 @@ $as_echo_n "checking whether ${OBJC} can compile ObjC++... " >&6; }
+ ## we don't use AC_LANG_xx because ObjC++ is not defined as a language (yet)
+ ## (the test program is from the gcc test suite)
+ cat << \EOF > conftest.mm
++#undef __OBJC2__
+ #include <objc/Object.h>
+ #include <iostream>
+ 
+@@ -24389,7 +24392,7 @@ else
+       cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h.  */
+ 
+-
++#undef __OBJC2__
+ #include <objc/Object.h>
+ 
+ #ifdef F77_DUMMY_MAIN